Uchicago Argonne, LLC

Donghan Kim

Christopher S Johnson

Sun-Ho Kang

Mahalingam Balasubramanian

The present invention provides an electrode material suitable for use as a cathode in a sodium electrochemical cell or battery, the electrode comprising a layered material of formula NaLiNiMnMO, wherein M comprises one or more metal cation, 0.24&#x2266;c/b&#x2266;0.5, 0&#x3c;d/b&#x2266;0.23, 0&#x2266;e/b&#x2266;0.45, 0&#x2266;f/b&#x2266;0.45, 0&#x2266;z/b&#x2266;0.45, the combined average oxidation state of the metal components (i.e., NaLiNiMnM) is in the range of about 3.9 to 5.2, and b is equal to (c+d+Ve+Xf+Yz)/2, wherein V is the average oxidation state of the Ni, X is the average oxidation state of the Mn, and Y is the average oxidation state of the M in the material. The combined positive charge of the metallic elements is balanced by the combined negative charge of the oxygen anions, the Na is predominately present in a sodium layer, and the Mn, Ni, and M are predominately present in a transition metal layer.

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Darien, IL, United States of America

Donghan Kim